1amu

PHENYLALANINE ACTIVATING DOMAIN OF GRAMICIDIN SYNTHETASE 1 IN A COMPLEX WITH AMP AND PHENYLALANINE

spinqualitylabelsall models 1amu, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1amu is a 2 chain structure with sequence from Brevibacillus brevis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AMP, MG, PHE, SO4 Gene: GRSA (Brevibacillus brevis) Activity: Phenylalanine racemase (ATP-hydrolyzing), with EC number 5.1.1.11 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The non-ribosomal synthesis of the cyclic peptide antibiotic gramicidin S is accomplished by two large multifunctional enzymes, the peptide synthetases 1 and 2. The enzyme complex contains five conserved subunits of approximately 60 kDa which carry out ATP-dependent activation of specific amino acids and share extensive regions of sequence similarity with adenylating enzymes such as firefly luciferases and acyl-CoA ligases. We have determined the crystal structure of the N-terminal adenylation subunit in a complex with AMP and L-phenylalanine to 1.9 A resolution. The 556 amino acid residue fragment is folded into two domains with the active site situated at their interface. Each domain of the enzyme has a similar topology to the corresponding domain of unliganded firefly luciferase, but a remarkable relative domain rotation of 94 degrees occurs. This conformation places the absolutely conserved Lys517 in a position to form electrostatic interactions with both ligands. The AMP is bound with the phosphate moiety interacting with Lys517 and the hydroxyl groups of the ribose forming hydrogen bonds with Asp413. The phenylalanine substrate binds in a hydrophobic pocket with the carboxylate group interacting with Lys517 and the alpha-amino group with Asp235. The structure reveals the role of the invariant residues within the superfamily of adenylate-forming enzymes and indicates a conserved mechanism of nucleotide binding and substrate activation. Structural basis for the activation of phenylalanine in the non-ribosomal biosynthesis of gramicidin S.,Conti E, Stachelhaus T, Marahiel MA, Brick P EMBO J. 1997 Jul 16;16(14):4174-83. PMID:9250661 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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